Gyroscopic compass.



1. TOYUKAWA..

GYHGSCUPIC CUMPASS.

anted Mar. 19, 1918.

2 SHEETS-SHEET l.

j. TOYOKAWA.

GYROSCOIC COMPASS. nPPucATzoN mtu mm1?.

a'nted Ma?. m 1918..

2 SHEETS-SHET 2.

"subyect of the Emperor ist lr seiten rosonnvm, or nonno, een.

evnosoorio soreness.

Specieetion of Letters Eetent.

lPatented Meiru i9, le.

rine. application :tiled December 21, 1914, Serial No. 878,290. Divided and this application :filed May l?,

i937. Serial No. 169,l69.

To olii wwm t may armoe/mt:

it known that l, l'onra TovonAWA, a, of Japan, residing at 3l Stride-Sho, Koishikoive-Ku, rlokyo, Japan, have inode a certain new and useful invention Gyroscopio Compasses, of which the following is e specification This invention relates to gyroscopic composses and the improved construction in ac corde-nce with my invention comprises two gym-Wheels arranged in Suche Way that the eide of rotetion of one of them is constrained to move in a vi'iorizontil plone and that ozt' the other of them is constrained to move in e, vertiosl pleno While being also eonstreined to move in the saine horizontal plane es the first mentioned wheel, the exis of which when the system is held by grnvity, will, in a, position of equilibrium, point to the celestial pole 'While the anis or the other Wheel will point to the lair-S. direction. The objects of my invention are rstly to apply the forego-ino principle in e gyro scoplc compass 'for linding the N.-S. direo tion; secondly, to determine 'the latitude oli.' a place es indicated by the inclination of the anis of a gyroivheel to the horizontal; thirdly, to dampen the oscillation, by e {ierible connection, between the tivo gym-Wheels so as to cause some torsional oscillation about the vertical axis and absorb the eni the horizontal exis sistance gi ourthly, to dampen the oscillation by means of s. suitabie resistance applied on by which the axis of the gyro-vvheel is constrained to nieve in a.. vertical plane; ithly, to correct the deflections of en ordinary gyroscopic compass, for a given latitude, instead of using the gyro- Wheel Whose axis of rotation is constrained to move in horizontal plane in the said arrangement, by lturning` the axis of the two gym-Wheels about the vertical axis relatively to each other according to the inclination of the exis of the gyro-Wheel Whose axis oi rotation is constrained to move in e, vertical plane; andsixthly, to simplify the aforesaid arrsngement in such manner that the revolving axle of the gym-Wheel` Whose exis of rotation is constrained to move in or 'this oscillation in a' suitable re-A Figures l and 2 illus-trate the principle or `Whole system of this invention, and show the side and frontV views respectively.

Figs. 3 end s show the side and iront views of the Whole system with damping arrangement.

Figs. 5 and 6 show in side and front view the connection between the first and second gym-Wheels, and Figs, 7 and 8 show in side and :iront views on an enlarged seele the connection between the said Wheels.

in Figs. lend 2, the exis of the first gym-Wheel l is constrained to nieve in e horizontal plane, that is, having e triodegree freedom of vmovement, While that of the second gyrowheel 2 is constrained to move in a 'vertical plane While being also eet' Bti

constrained 'to movein the seme horizontal plane as the first Wheel l, that is, having a l three-degree freedom of movement. Wnen the frame-casing or "housing, carrying the said gym-Wheels isheld by gravity, or by other suitable means, for the aforesaid purpose, the axis of Wheel l Will begin to turn to N. S. direction as in the ordinary gyruscopic compass, but wheel 2 will resist this motion of the Whole frame Whilent the seme time being enforced to turn singularly in a vertical plane because of gyroscopic re-- turning moment of Wheel l freins on its component on a horizontal piane.' These motions will continueond berepeated, that is, they will oscillete. if the 'energyP required or those oscillations .be absorbed, the Whole system will quickly settle down, and the exis of wheel l will point to the sist-ance and procession' of Wheel 2 until th'e` lll@ N. S. direction, and that of wheel 2 will point to the celestial pole, because the axes of gym-wheels makes smaller angle to the axis of the earths' rotation than that they would make in other positions, that is, beingthe most stable in that position..

This position of wheel 2 is used to determine the latitude, and to'ix the axis of the said gyro-wheel in correct relation, in case of the ordinary gyroscopic compass (which requires correction for a given latitude) being used in place of the aforesaid first gyro-wheel. (This will be further eX- plained laten) Again the determination of the latitude is etlected by means of a dial il, attached to the axle which carries the casing of wheel 2.

As shown in Figs, 3 and 4, the system of my invention can be used to dampen the oscillations of the wheels by a flexible connection between the two gym-wheels 5 and 6 about the vertical axis by holding casing 7 ofwhcel 5 by spring 8 or by gravity or by other suitable means to frame 9, so as to cause torsional oscillation between these elements, the energy required for this oscillation being absorbed in a suitable resistance, for instance, spring 10 bearing on axis 11, can be used for this purpose. The intensity of this resistance is so arranged that the correct relation of, the axes of the two gyrowheels will not tiiereby be disturbed in their position of rest. In this arrangement the oscillations of the `gym-wheels will taire place as in the'irst described arrangement, while 4at the same time these oscillations cause the oscillation between casing Y and frame 9, and it will be absorbed 1n some suitable resistance, and the amplitude ofv these oscillations will be continually diminished and the axes will settle down into a position of equilibrium., l J

A very simple method for damping is to apply a suitable 'resistance to the axle which supports the casing as in 'the first arrangenient.

ln an ordinary gyroscopic compass the damping of the oscillations is eectcd by the gyro-wheel during,- its vertical oscillation, and such damping arrangement introduces the deflection due to latitude. My present invention avoids this trouble. ln

case of the ordinary gyroscopic compass bef ing used, which requires a correction due to latitude, in place'of the first gyro-Wheel, it is necessary `to turn the axes of the two gym-Wheels relatively on the horizontal plane, the amount of deflection corresponding to the inclination of the anis of the second gyro-wheel, in order to obtain the correct lil, SL direction. As shown .in Figs. 6, i', and 8 the movement of cani la which is lined on thc turninp, asile olf wheel. l@

Landes? transmits motion to lever 15, which turns about a vertical axis supporting frame 16 of wheel l2 relatively to frame 17. To that end an alternative construction may be used in which the axle of the carrier of wheel 2 is inclined from the horizontal so as to cause a suitable angular displacement approximately equal, to the deflection caused by the axes ofthe two gyro-wheels relatively to cach other on the horizontal when the axis of wheel 2 isinclined' from the horizontal.

For the purposes of more clearly illustrat-` ing my invention and of enabling those skilled inthe art to understand and apply the principles thereof, I have shown and described the various embodiments thereof, but this present application is a divisional application of my application Serial No. 878,290, filed Dec. 21, 1914, and the subject matter of the present case is directed especially to the/cam connection between the axle o1 the wheel 13 and the support 16 for the wheel 12. i

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what l claim is l. In a gyroscopic compass, gym-wheels respectively having two degree and three degree freedoms of movement, the axes df said wheels, when in equilibrium, always pointing, respectively, to the north-south and to the celestial pole, and means to rock thc support of one of said wheels relatively to the support of the other wheel.

2. ln a gyroscopic compass, gym-wheels respectively having two degree and three degree freedoms of movement, the axes of said wheels, when in equilibrium, always pointing respectively, to the north-south and to tbe celestial pole, supports for said Wheels, and a cam controlled. connection'between said supports for rocking one of said supports relatively to the other oi' said supports.

3. In a gyroscopic compass, gym-wheels respectively havin' two degree and three degree freedoms o movement, the axes of said wheels,y when in equilibrium, always pointing, respectively, to the north-south and to tbe celestial pole, supports for Vsaid wheels, a cani carried by the axle of one of said wheels, and a connection between said cam and the support for the other of said wheels whereby said support is rocked coincidently with the axle of said first mentioned wheel, Y

fl. ln a gyroscopic compass, gyro wheels respectively having two degree and three degree freedoms or movement, the axes of said wheels, when in equilibrium, always pointing, respectively, to the .north-south and the support www? @n @o the celestial poles, supports for said;v

Wheels, a cam cal-med bythe axlo of the whee, the axis of which points to the celestial pole, and means connecting said com for the Wheel the axis of 'which points to the north-south poles, for rocking said support coincdently with tho rotation of the milo of mi@ Erst msmons wheel.

In testimony whereof l have heeunto set i@ myhand on ths'thpsy of Moy, A. D. 191

n mm. Toomws. 

